https://www.bleepingcomputer.com/news/microsoft/microsoft-will-disable-insecure-tls-in-office-365-on-oct-15/ > Microsoft has set the official retirement date for the insecure Transport Layer Security (TLS) 1.0 and 1.1 protocols in Office 365 starting with October 15, 2020, after temporarily halting deprecation enforcement for commercial customers due to COVID-19. > "As companies have pivoted their supply chains and countries have started to re-open we have re-established a retirement date for TLS 1.0 and 1.1 in Office 365 to be October 15, 2020," the company said in the MC218794 Microsoft 365 admin center announcement on Friday.